JPS63187139A - Method for classifying kind of color manuscript - Google Patents

Abstract

PURPOSE:To classify a color manuscript into a photograph one and a printing one, by measuring the reflected lights of the color manuscript using two kinds of sensors having sensitivity peaks at different wavelengths in the wavelength region of one primary color light among three primary color lights to compare said reflected lights. CONSTITUTION:The reflected lights from a color manuscript 10 are measured by sensors 14, 15 to be converted to density signals by an A/D converter 17 and said signals are sent to RAM 19 through a photometric data processing part 18 to perform preparatory scanning. Next, the photometric data processing part 18 reads the density signals from RAM 19 to discriminate the same by a color manuscript kind discrimination part 20 and a process condition is set on reference to ROM 22 so as to obtain the optimum copy image quality. When red light is measured to perform discrimination, sensors having sensitivity peaks at 630+ or -40mm, 680+ or -40mm are used. Since no accurate discrimination can be performed only by one primary color light, green sensors having sensitivity peaks at 540+ or -15mm, 570+ or -15mm are together used and, when density difference is calculated using four kinds of densities to perform judgement on the basis of a threshold value, a photograph manuscript and a printing manuscript can be separated still more accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color copying machine suitable for copying color originals having halftones, such as an electrophotographic color copying machine, reversal color paper, and a diffusion transfer type photosensitive material. The present invention relates to a color document type classification method used in a silver halide photographic color copying machine (optical printer), a thermal transfer color copying machine, an inkjet color printer, a laser color printer, etc.

[Conventional technology]

Recently, color copying machines have become popular, but color copying requires good color balance as well as density. In this color copying, photographs and printed materials are often used as color originals, but due to differences in coloring materials and differences in human visibility and spectral sensitivity of copying materials, the color balance of these may differ under the same copying conditions. It becomes a duplicate image. For example, in color printed originals, the spectral density distributions of magenta ink and cyan ink overlap greatly, so in a color copying machine that has set copying conditions so that color printed originals can be finished well, magenta density Copying conditions suppress formation. Therefore, when a color photo original is copied under these copying conditions, a color copy image with a greenish tinge due to lack of magenta color will be created.

To solve this problem, conventional color copiers
Copying conditions (color filter adjustment amount, exposure amount, charge amount, development bias amount) are set according to color photo originals and color print originals, and the operator selects the color original type by operating the selection keys at his/her discretion. The copy conditions are selected accordingly.

[Problem that the invention seeks to solve]

As mentioned above, in conventional color copying machines, the type of color document is determined by the operator's experience, taking into consideration the presence or absence of halftone dots, etc. However, operators without specialized knowledge cannot use current color printing technology. Advances have made it difficult to accurately distinguish between a color photograph and a color print made from it.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a color document type classification method that allows accurate discrimination of color document types.

[Means for solving problems]

In order to achieve the above object, the present invention detects the reflected light of a color document using two types of sensors having sensitivity peaks at different wavelengths within the wavelength range of one of the three primary color lights. By measuring and comparing the two types of measured values obtained, color originals are classified into at least photographic originals and printed originals.

Another invention provides first and second sensors that have sensitivity peaks at different wavelengths within the wavelength range of the first primary color light of the three primary color lights, and a sensor that has sensitivity peaks within the wavelength range of the second primary color light. measuring the reflected light of each area of the color document using third and fourth sensors having sensitivity peaks at different wavelengths;
Compare two types of measurement values of the same area measured by the first and second sensors, compare two types of measurement values of the same area measured by the third and fourth sensors, and compare the results of these two comparisons. Based on these combinations, color originals are classified into at least photographic originals and printed originals. The comparison may be performed by using the output of the sensor as it is, or by converting it into a concentration value using a logarithmic converter, and there are other methods of comparison, such as determining a difference or determining a ratio.

[Action of the invention]

The density measurement is carried out using any one of the three primary color lights, for example green light or red light, before color copying. When measuring green light, a first sensor having a sensitivity peak at 540±15 nm and a second sensor having a sensitivity peak at 570±15 nm are used. Also, when measuring red light, use 630±4 as the first sensor.
A sensor having a sensitivity peak at Q nm is used, and a sensor having a sensitivity peak at 680±40 nm is used as the second sensor.

Two types of measurement values measured for the same color are compared, and color originals are classified into at least color print originals and color photographic originals. In accordance with this classification determination, the copying conditions of the color copying machine to be used are set, and a good color balance is achieved taking into account the type of color document.

The measurement may be performed by measuring the entire color document, one-dimensionally using slit light, or two-dimensionally using a color image sensor.

Another invention provides first and second sensors that have sensitivity peaks at different wavelengths within the wavelength range of the first primary color light of the three primary color lights, and a sensor that has sensitivity peaks within the wavelength range of the second primary color light. hand,
The third and fourth sensors having sensitivity peaks at different wavelengths are used to measure the reflected light of each area of the color document, and the two types of measurement values of the same area measured by the first and second sensors are combined. It also compares two types of measurement values of the same area measured by the third and fourth sensors, and from a combination of these two comparison results, classifies the color original into at least a photographic original and a printed original. This is what I did. That is, in the present invention, a total of four types of reflected light, two types each of the first and second primary color lights, for example, green light and red light, are measured. The obtained two types of measurement values in the green wavelength range are compared for each area, and the difference is the first
If the number of documents that is equal to or less than a second threshold is less than a certain value, the color document is determined to be a print document, and if the number of documents that are equal to or greater than a second threshold is equal to or greater than a certain value, the color document is determined to be a photo document. . For items that cannot be classified by these judgments, two types of measurement values in the red wavelength range are used, and if the number of items whose difference is within the third threshold exceeds a certain value, it is classified as color. The original is determined to be a photographic original, and the other originals are determined to be printed originals.

Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

FIG. 2 shows the spectral reflection densities of color photographs and color prints with an average color distribution recording medium-high density color images. Density curve 2 shown by a solid line is the density distribution of a color photograph. A density curve 3 shown by a dotted line is a density distribution of color printing, and there is a peak of reflection density in green.

The magenta dye used in color photography is 530~
The maximum concentration (maximum absorption wavelength) is at 560 nm, and the maximum concentration of cyan dye is around 650 nm. Furthermore, magenta and cyan dyes have a characteristic that their density (absorption) decreases rapidly around this maximum absorption wavelength.

On the other hand, magenta ink used for color printing is
It has a maximum concentration near 57 Onm.

In addition, cyan ink has a nearly flat density from 6 (10 to 7) (10 nm), and at wavelengths longer than 7 (10 nm), there is a drastic decrease in density compared to cyan dyes used in color photographs. .

In this way, since colorants with different characteristics are used depending on the type of color original, two types of sensors with sensitivity peaks at different wavelengths within the same color wavelength range are used to measure the reflected light. By comparing the two types of measured values obtained, for example, spectral reflection density or spectral intensity, the type of color document can be determined. In Figure 3,
Curve g1 shows the sensitivity curve of the first green sensor for measuring green light among the three primary color lights, and has a sensitivity peak at a wavelength of 540±15 nm. The curve g2 is 3
This shows the sensitivity curve of the second green sensor for measuring green light among the primary color lights, and the wavelength is 570 ± 15 nm.
There is a sensitivity peak at Curve r1 shows the sensitivity curve of the first red sensor for measuring red light among the three primary color lights, and has a sensitivity peak at a wavelength of 630±40 nm. Curve r2 shows the sensitivity curve of the second red sensor for measuring red light among the three primary color lights, and has a sensitivity peak at a wavelength of 680±40 nm. In particular, the wavelength r1
If the sensitivity peak of is at 650 ± 20 nm, then the wavelength r2 has a sensitivity peak of 7 (10 ± 20 nm), and the wavelength r
When the sensitivity peak of 1 is at 610±20 nm, it is desirable that the sensitivity peak of wavelength r2 is 660±20 nm.

When determining the type of color document by measuring green light, first and second green sensors are used.

On the other hand, when determining the type of color document by measuring red light, first and second red sensors are used. Also,
Some color originals have a low green component or a low red component, so it is not possible to correctly determine the color original type if only one of the green or red light is measured. . Therefore, if four types of sensors are used to measure green light and red light, and the four types of densities obtained are used, the determination accuracy is improved.

FIG. 1 shows the basic configuration of the present invention.

Prior to color copying, prescanning is performed, and during this prescanning, color original 10 is illuminated with light source 11 while moving in the direction of the arrow. The reflected light from the color original 10 is passed through the lens 12.13 to the first
The sensor 14 and the second sensor 15 measure each other. 1. The color original 10 is stopped, and the light source 11 is moved instead, and the reflected light from the color original 10 is guided to the first and second sensors 14, 15 via a mirror system (not shown). It's okay.

The output signals of the first and second sensors 14, 15 are amplified by an amplifier 16 and then converted to a concentration signal by an A/D converter 17. These two types of density signals are sent to the RAM 19 via the photometric data processing section 18. After pre-scanning, the photometric data processing unit 18 reads two types of density signals for each color from the RAM 19 and compares them. This comparison result is sent to the color document type determination section 20, where the color document type is determined.

The determination result of the color document type is sent to the process condition setting section 21, and the process condition is set by referring to the ROM 22 which stores the process conditions for the color document type. These process conditions are for controlling the quality of the copied image to be good depending on the type of color original, and naturally vary depending on the type of color copying machine, but in general, the One example of this is to control copying conditions such as a filter, exposure amount, charge amount, and development bias amount to improve density and color balance.

Furthermore, process conditions include, in addition to controlling copying conditions, selection of copying materials with different characteristics such as gradation and surface image quality of the three forming pigments, and selection and control of development processing conditions such as development processing steps and time. This includes selection and control of the light source that illuminates the original, gradation control such as sub-exposure, and image quality control such as color reproduction, tone reproduction, sharpness, etc. in the scanned image.

Next, an example of determining the color document type will be described.

FIG. 4 shows an embodiment in which the type of color document is determined by measuring red light. In this embodiment, as shown by rl in FIG. 3, a sensor having a sensitivity peak at 630±30 nm is used as the first sensor. Second sensor 15
As shown by r 2 in Figure 3, 7 (10 ± 3
A material having a sensitivity peak at 0 nm is used. Using these sensors 14.15, 2 per slit area
Measure the red density R1i, R2, and store it in RAM.
19 to memorize it. Next, the red color densities R1t and R2i of each slit area are read out in order, and those satisfying the following conditional expression are extracted.

KDI <(R1 Direct+R2i)/2 <KO2 Here, KDI and KO2 are constants, for example rO, 3J
, '1.5J is used.

The red density R1i of the slit area thus extracted,
The ratio (R1i/R2) is calculated from R2 direct. This ratio is rl, 1. If it is above, it is determined that it is a color photographic document, and if it is less than "1°1", it is determined that it is a color print document. Process conditions are set according to this determination result, and color copying is performed under these conditions.

In the above explanation, from the size of the ratio of the two types of red density,
The color original type is determined, but this is due to the difference (RI+
R21) may also be used. In this case, the difference is rO,1
, or more, it is determined that it is a color original, and rO,IJ
If there are no grooves, it is determined that the original is a color printing original.

Further, although the color original 10 is subjected to area photometry, the reflected light from the entire surface of the color original 10 may be incident on the sensor to perform average photometry. You can also photometer a point.

Instead of the red sensor, a green sensor may be used to determine the color document type. In this case, the first sensor 14. As the second sensor 15, one having the sensitivity curves gl and g2 shown in FIG. 3 is used, and two types of green density C1i, G2. Measure. If the ratio of the two types of green densities (Gli/G25) is equal to or greater than rl, oJ, it is determined that the original is a color photographic original, and if there are no K, OJ grooves, it is determined that it is a color printing original. do. In addition, when using the difference between two types of green density (Gli - G2i), if it is ro, o, or above, it is considered to be a color photographic original, and if it is ro, oJ, or more, it is considered to be a color printing original. judge.

Furthermore, by statistically processing two types of density, for example, green density, it is possible to determine the type of color document. That is,
If we take the density difference (Gl-G2) on the vertical axis and the green color density G1 on the horizontal axis, we get a density distribution as shown in Figure 5.
The type of color document can be determined by checking which density distribution curve it belongs to. Furthermore, if a histogram as shown in FIG. 6 is created, the peak positions will be different, so by examining these peak values, it is possible to distinguish between a color photographic original and a color printed original.

Figure 7 shows a device that measures red light and green light and uses the four types of reflection densities obtained to determine the type of color original. A code is attached. Behind the four lenses 25-28, four types of sensors 29-32 having sensitivity curves gl, g2°rl, and r2 shown in FIG. 3 are arranged, respectively. The output signals of these sensors 29 to 32 are processed in the same way as in the embodiment described above and converted into four types of concentration signals.

FIG. 8 is an example of a discrimination process using four types of density values. First, the green density is read out for each slit area, and one that satisfies the following conditional expression is selected.

G1. -G2. <-0,10...(]) This conditional expression (
If there are any or more items that satisfy 1), it is determined that the document is a color print document. Here, K (which is a constant and corresponds to, for example, 20% of the total number of slit areas) is used.

If the number of conditions that satisfy conditional expression (1) is less than 1, it is determined whether the following conditional expression is satisfied.

01 straight - G2i>0.1...(2) Conditional expression (2)
If there are at least one document that satisfies the above criteria, it is determined that the document is a color photo document.

If the number of items satisfying conditional expression (2) is less than 1, the following conditional expression is used for determination.

R1>0.4 (3) If conditional expression (3) is not satisfied, it is determined that the document is an intermediate color document. This intermediate color document is a document with many white backgrounds, such as character images and illustration images.

Note that the same process conditions as those for color printing documents may be set for this intermediate color document.

Next, it is determined whether there are at least one condition that satisfies conditional expression (4).

R11-R2=>0.1 (4) If this is satisfied, it is determined that the document is a color photographic document, and if this is not satisfied, it is determined that the document is a color print document. This conditional expression (4) specifically states that the sensitivity peak of the sensitivity curve r1 is 65
At 0±20 nm, the sensitivity peak of the sensitivity curve r2 is 7 (10
It is effective when the range is ±20 nm. However, the sensitivity curve r
When the sensitivity peak of R1 is 610±20 nm and the sensitivity peak of R2 is 660±20 nm, it is better to use Rli −R2i < 0.0 (4”).This conditional expression (4 If (2) is satisfied, it is determined that the document is a color photograph; otherwise, it is determined that the document is a color print document.

Further, depending on the magnitude relationship between the green density and the red density, it is preferable to determine whether or not to use the density for discrimination, or to determine the selection of discriminants (1) to (4).

According to the above procedure, the originals are classified into color photo originals, color print originals, and intermediate color originals, and the process conditions are set according to the types of these color originals before color copying is performed.

FIG. 9 shows a silver salt photographic color copying machine embodying the present invention. Color original 3 is placed on transparent original table 35.
6 is placed with the document side facing down. In reality, a color original 3 is used with a temporary document holder (not shown) whose bottom surface is white.
6 is pressed down from above. A white standard plate 37 is attached to the lower surface of the left end of the document table 35, and by measuring the reflected light, changes over time of the light source and color filters, etc., which will be described later, are corrected.

The light source unit 38 includes a light source 39. It has a built-in reflector 40 and a mirror 41, and reciprocates in parallel with the document table 35 to illuminate the color document 36 with a slit. The mirror unit 42 includes two mirrors 43 . extending in a direction perpendicular to the paper surface.
44, and returns the light from the light source unit 38 in parallel. Further, this mirror unit 42 moves in the arrow direction during magnification conversion.

The lens unit 46 moves back and forth along the optical axis in synchronization with the light source unit 38 in order to correct the focal shift caused by the movement of the light source unit 38. This lens unit 46 has a yellow filter Y between a front group 47 and a rear group 48.
Magenta filter M.

A cyan filter C is arranged. These color filters Y, M, and C are movable in a direction perpendicular to the optical axis, and the amount of insertion thereof adjusts the quality of the slit light to correct the color balance. Also, behind the rear group 48,
Two aperture plates 49,50 are arranged which move in opposite directions.

The light passing through the lens unit 46 passes through the mirror 52.5.
3 and then reaches an optical path switching mirror 55 whose rotation center is a shaft 54. During pre-scanning, the focusing mirror 56 is inserted into the optical path as shown by the dotted line, the optical path switching mirror 55 is also withdrawn from the optical path as shown by the dotted line, and the reflected light from the color original 36 is collected for measurement. into the means 57.

The condensing mirror 56 includes a plurality of mirrors 56a, and as shown in FIG. 10, each mirror 56a is arranged at an angle corresponding to the distance from the optical axis, thereby condensing the slit light. and put it into the measuring means 57. As shown in FIG. 11, the measuring means 57 includes a first blue sensor 5.
7a, a second blue sensor 57b, a first green sensor 57C9, a second green sensor 57d, a first red sensor 57e, and a second red sensor 57f.

The first blue sensor 57a has a sensitivity peak of about 4 (
10 nm, and the second blue sensor 57b has a sensitivity peak at about 450 nm. First green sensor 5
7c has a sensitivity curve g1 shown in FIG. 3, and the second green sensor 57d has a sensitivity curve g2.

The first red sensor 57e has a sensitivity curve r1, and the second red sensor 57f has a sensitivity curve r2.

The magazine 60 contains a photosensitive sheet 6 made of a diffusion transfer type photosensitive material.
1 is stored in a rolled state. This photosensitive sheet 1-61 is drawn out by a pair of drawing rollers 62 and 63, and after being drawn out a certain length, is cut by a cutter 64. The cut photosensitive sheet 61a stops at a position where its leading end is caught by a pair of rollers 65 and 66. Opposed to this roller pair 65.66 is a roller pair 67.6.
A slit exposure position is formed between these four rollers 65 to 68, and the light from the light switching mirror 55 is incident thereon.

During copying, rollers 65 to 68 rotate in synchronization with light source unit 46 to transport photosensitive sheet 61a toward rotating roller 70. A guide 7I is arranged so as to surround the outer periphery of this rotating roller 70, and a driven roller 72 is arranged so as to be in contact with it. The exposed photosensitive sheet 61a is reversely conveyed by a rotating roller 70 and stopped at a position where its leading edge hits a first stopper 73.

The image receiving sheet 75 has a developing body 76 containing a developer and a bag-shaped funnel 77 that guides the developer flowing out from the developing body 76 at its tip end. A plurality of image receiving sheets 75 are stored in a cassette 78 in a stacked state. The roller 79 enters into the cassette 78 when the cassette 78 is installed, and during pre-scanning, the uppermost image receiving sheet 75 is sent out and kept on standby while being gripped by the rollers 80 and 81. During color copying, the pair of rollers 80 and 81 rotate to transport the image receiving sheet 75 to a position where its leading edge hits the second stopper 82. Note that the rollers 79 to 81 are arranged so as to sandwich the vicinity of both ends of the image receiving sheet 75 in order to prevent the developing pond 76 from being crushed. The photosensitive sheet 61a and the image-receiving sheet 75 have substantially the same structure as instant color films that are already commercially available.

The photosensitive sheet 61a and the image receiving sheet 75 are
After being joined, the sheet is passed between a pair of developing rollers 86 and 87. At this time, the developing pond 76 is torn open, and the flowing developer is spread out between the photosensitive sheet 61a and the image receiving sheet 75 to a uniform thickness. This developer was developed 2
The two sheets are placed on a constant temperature plate 88 and left until a predetermined development time has elapsed, and then the image receiving sheet 75 is peeled off.

Next, the operation of this color copying machine will be explained. First, a color original 36 to be copied is placed on the original table 35, and then a copy key (not shown) is operated. When the copy key is turned on, feeding of the photosensitive sheet 61 and image receiving sheet 75 and pre-scanning are started as will be described later.

That is, when feeding the image receiving sheet 75, the rollers 79 to
81 rotates to send out the top one among the plurality of image receiving sheets 75 accumulated in the cassette 78. The fed-out image receiving sheet 75 stops with its leading edge caught between a pair of rollers 80 and 81. Further, the photosensitive sheet) 61 is pulled out by a pair of rollers 62 and 63,
When it is pulled out to a certain length, it is cut by a cutter 64. During this cutting, the tip of the photosensitive sheet 61a is held at the roller 67°6.
8, the photosensitive sheet 61a is further fed by these rollers 67 and 68. And photosensitive sea) 6
The rotation of the rollers 65 to 68 is stopped when the tip of the roller 1a is bitten by the pair of rollers 65 and 66.

When starting the pre-scan, first select the color filter Y.
, M, and C to their standard positions.

Also, set the aperture plates 49 and 50 at standard positions, and insert the condensing mirror 56 into the optical path as shown by the dotted line.
Then, the switching mirror 55 is retracted to the position shown by the dotted line. Under this state, the light source unit 38 and the lens unit 46 are moved synchronously to start prescanning. At the beginning of this pre-scan, the light emitted from the light source 39 is reflected by the standard plate 37, and then the mirrors 41 to 44
゜Lens unit 46. The light passes through the mirrors 52 and 53 one after another and then enters the condensing mirror 56. This condensing mirror 56 is
As shown in FIG. 10, the slit light is focused and guided to a measuring means 57. Since the light source unit 38 is moving at a constant speed, it illuminates the color original 36 with slit illumination following the standard plate 37. The reflected light from the color original 36 is also measured by the measuring means 57. When the pre-scan is completed, the illumination unit 38 and lens unit 46 return to the initial positions shown in FIG. 9. At the same time, the condensing mirror 56 is retracted from the optical path as shown by the solid line, and the switching mirror 55 is inserted into the optical path.

Using the six sensors 57a to 57f, the standard plate 3
By performing the slit measurement of 7, a total of six types of reflection densities, two types each for blue light, green light, and red light, can be obtained for each slit area. For these six types of reflection densities, blue density, green density, and red density are calculated by adding up the reflection densities of the same color and finding the average value. Since the three color densities of this standard plate 37 are known in advance, based on the amount of deviation from the current three color densities obtained by pre-scanning,
Changes in the light source 392 color filter over time can be detected.

Also, for the color original 36, six types of reflection densities are measured for each slit area. Among these reflection densities, two types of green densities and two types of red densities are taken out, and the type of color document is determined in accordance with the procedure shown in FIG.

When it is determined that the color original 36 is a color photograph, the amount of color filters for color photographs stored in the ROM 22 is read out, and the amount of color filters Y, M, and C inserted into the optical path is adjusted; Improve color balance.

On the other hand, if it is determined that the color original 36 is a color printing original, the amount of color filters for color printing is stored in the ROM2.
2 and adjust the amount of insertion of color filters Y, M, and C into the optical path.

By adjusting the filters as described above, it is possible to improve the color balance of the copied image for most color originals, but color correction may be further performed for each color original. In this case, the blue density is determined by adding the six types of reflection densities obtained by measuring the color original 36 for each color and finding the arithmetic mean.

Calculate green density and red density. Then, based on these three color densities, the correction amounts for red, green, and blue are calculated, respectively.

For calculating this correction amount, a well-known exposure calculation formula for a photographic printing machine can be used. The amount of deviation due to the above-mentioned change over time is added to the obtained exposure amount of each color, and the amount of insertion of the yellow filter Y, magenta filter M, and cyan filter C into the optical path is adjusted according to the calculation results.

Furthermore, if the correction cannot be completed with these color filters Y, M, and C, the diaphragm plates 49 and 50 are slid.

When the adjustment of the color filters is completed, the light source unit 38
moves again and slit-illuminates the color original 36. The rollers 65 to 68 rotate in synchronization with this slit illumination,
The photosensitive sheet 61a is continuously moved to expose it to slit light. By this slit exposure, the photosensitive sheet 61a
The image of the color original 36 is recorded as a latent image. The photosensitive sheet 61a is transferred to a position where its leading end collides with a first stopper 73 while being reversed by a rotating roller 70. In this state, the rear end of the photosensitive sheet 61a is loosely sandwiched between the rotatable rollers 72.

After positioning the photosensitive sheet 61a, the first stopper 73 rotates in the direction of the arrow and retreats from the path of the photosensitive sheet 61a. Next, the rollers 80 and 81 rotate to transport the image receiving sheet 75 and insert it under the photosensitive sheet 61a. These rollers 80, 81 are connected to the image receiving sheet 75.
It stops when its tip hits the second stopper 78.

As a result, the photosensitive sheet 61a is placed over the funnel 77 of the image receiving sheet 75. Next, Sheila 8
5 descends and inserts the tip of the photosensitive sheet 61a into the funnel 7.
Join on top of 7. This bonding is to prevent misalignment of the photosensitive sheet 61a and image receiving sheet 75 during development processing, thereby preventing blurring of the color copy image and misalignment of the copying position. Hot melt (adhesive) is applied on top of the funnel 77 to make it.

After retracting the second stopper 82, the roller so
, ai are rotated again to push the rear end of the joined image-receiving sheet 75 so that it is gripped by the unfolding rollers 86 and 87. When this image-receiving sheet 75 is transferred, the photosensitive sheet 61a bonded thereto is also transferred, but at this time, the roller 72
rotates following the photosensitive sheet 72.

Since the developing rollers 86 and 87 rotate together with the rollers 8o and 81, the two sheets 61a.

75 and transfer it while applying pressure.

At the initial stage of this biting, the developer bond 76 splits, so the developer stored inside is released into the two sheets (6).
The liquid is developed to have a uniform thickness between 1a and 75. The two unfolded sheets 61a and 75 are heated to a predetermined temperature, for example, 2.
It is left on a constant temperature plate 88 kept at 5°C. When the image receiving sheet 75 is peeled off after a predetermined period of time has elapsed, a color copy with a color image recorded thereon by well-known diffusion transfer can be obtained.

FIG. 12 shows another embodiment of the invention. A color original 101 is mounted on the outer periphery of a platen 1 (10), and the slit is illuminated by a light source 102.The reflected light from this color original 101 is transmitted through a slit 103 and a lens unit 1.
04 and then reaches the optical path switching mirror 105.

During pre-scanning, the optical path switching switch 105 is set at the position shown by the solid line, and by rotating the platen 1 (10), the color original 101 is sequentially slit-illuminated from one end to the other. The reflected light from 101 is measured by measuring means 106. From the six types of reflection densities measured by this pre-scan,
Based on the above-mentioned procedure number, the type of color original 101 and the amount of color correction are calculated.

When the pre-scan is completed, the optical path switching mirror 10
5 retreats to the position indicated by the dotted line. And the platen lO
O rotates three times in succession, and during each rotation, a red filter R1, a green filter G, and a blue filter B are sequentially inserted into the optical path.
A color copy image is recorded by sequentially using three colors. In other words,
First, when recording a cyan image, a red filter R is inserted in the optical path instead of the light shielding plate 107, and the voltage applied to the charger 110 is adjusted according to the red color correction amount obtained by pre-scanning.

When the photosensitive drum 111 rotates in synchronization with the platen 1 (10), its outer peripheral surface is charged with an electric charge that takes into account the amount of red color correction.The light that has passed through the red filter R passes through the mirror 112 to the photosensitive drum 111. is reached and exposed to light. Through this exposure, the charge is removed from the areas exposed to light, and charges remain only in the areas not exposed to light. After this exposure, the electrostatic latent image recorded on the photosensitive drum 111 but,
The cyan toner image is developed by a cyan developing device 113 to form a cyan toner image.

Simultaneously with the slit exposure of the photosensitive drum 111, the roller 115 rotates and feeds out the recording paper 116.

This recording paper 116 is guided while being wrapped around the outer periphery of the drum 114, and the photosensitive drum 11 is guided by a charger 117.
A cyan toner image of No. 1 is transferred thereto. After this transfer, the recording paper 116 is transported together with the drum 114, but since the gate 118 is at the position shown by the dotted line, the recording paper 116
16 is rotated once more. Note that reference numeral 119 is a cleaner for removing toner that has not been transferred to the recording paper 116.

After the transfer of the cyan toner image, a green filter G is inserted into the optical path. In this state, the platen 1 (10) and the photosensitive drum 111 rotate synchronously, so that an electrostatic latent image of a green image is recorded on the photosensitive drum 111. When recording this green image, the voltage applied to the charger 110 is is set to a standard value for color printed originals and intermediate color originals, and is set to a higher voltage than the standard value for color photographic originals.

The green electrostatic latent image recorded on the photosensitive drum 111 is
The toner image is developed by a magenta developer 120 and converted into a magenta toner image, which is transferred to a recording paper 116 by a charger 117 . Next, a blue filter B is inserted into the optical path, and a blue electrostatic latent image is formed on the photosensitive drum 111. This blue electrostatic latent image is developed into a yellow toner image by a yellow developing device 121 and then transferred onto the recording paper 114.

In this way, when the platen ioo, the photosensitive drum 111, and the drum 114 continuously rotate to sequentially record a cyan toner image, a magenta toner image, and a yellow toner image on the recording paper 116, the gate 118 moves to the position shown by the solid line. For this purpose, the recording paper 116 leaves the drum 114 and rides on the conveyor belt 122, and is sent to the fixing device 123. This fixing device 123 pressurizes and heats the recording paper 116 to adhere the three-color toner to the recording paper 116, and transfers this to the tray 12.
Discharge to 4.

A single color document may contain a mixture of color printing and color photographs. Even in such a case, the present invention can be used to determine the document type of each part of a color document and to determine its area and area ratio. For this mixed document, it is preferable to select a desired copying condition from among a plurality of copying conditions prepared in advance, depending on the area ratio of each color document type, the location occupied in the document, importance, etc.

In addition to the above categories, there are also black-and-white manuscripts and manuscripts with many black versions.

Even monochromatic color originals can be easily classified.

In the above embodiment, slit photometry is performed on a color original, but average photometry may be performed by inputting the reflected light from the entire surface of the color original into the sensor, or a color image area sensor may be used to measure each point of the color original. may also be photometered.

Although red or green light or both of the three primary color lights are used, in addition to this, for example, 4 (10 to 5) (10 nm) blue light may be measured and combined with this to determine the type of color original. good.

〔Effect of the invention〕

As described in detail above, according to the present invention, the reflected light of a color document is measured using two types of sensors having sensitivity peaks in different wavelength ranges for at least one of the three primary color lights, Since the color document type is determined by comparing the two types of measured values obtained, the color document type can be determined with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an outline of the present invention. FIG. 2 is a graph showing the spectral reflection densities of a color photographic original and a color printed original on which medium-high density color images are recorded. FIG. 3 is a graph showing the relative sensitivity of the sensor. FIG. 4 is a flowchart showing an embodiment in which the type of color document is determined using two types of red density. FIG. 5 is a graph showing the relationship between the density difference (Gl-02) and G1 between a color photographic original and a color printed original. Figure 6 shows the density difference (G) between a color photographic original and a color printed original.
1-02) is a histogram showing the distribution of FIG. 7 is a schematic diagram showing the main part of an embodiment for determining the type of color original by measuring green density and red density. FIG. 8 is a flowchart of an embodiment in which the color document type is determined using green density and red density. FIG. 9 is a schematic diagram showing an example of a silver halide photographic color copying machine embodying the present invention. FIG. 10 is a sectional view of the condensing mirror. FIG. 11 is a plan view of the measuring means. FIG. 12 is a schematic diagram showing an example of an electrophotographic color copying machine embodying the present invention. 10...Color original 14.15...Sensors 29-32...Sensor 35...Original table 36...Color original 37...Standard plate 38...Light source unit 46...Lens unit 49 .50...Aperture plate 55...Switching mirror 56...Collecting mirror 57...Measuring means 60...Magazine 61...Photosensitive sheet 78...Cassette 86.87...Developing roller lOO...・Platen 101 ・・Color original 105 ・・Switching mirror 106 ・・Measuring means 110, 117 ・・Charger 111 ・・Photosensitive drum 116 ・・Recording paper. Chikanaga+nm) -Q Figure 10 6a Procedural amendment

Claims (10)

[Claims] (1) Two types of light reflected from a color original are measured using two types of sensors that have sensitivity peaks at different wavelengths within the wavelength range of one of the three primary color lights. A color document type classification method characterized by classifying a color document into at least a photo document and a print document by comparing measured values. (2) The color document type classification method according to claim 1, wherein the one primary color light is red light. (3) One of the two types of sensors has a sensitivity peak of 6.
30±40 nm, and the other has a sensitivity peak of 680±4
3. The color document type classification method according to claim 2, wherein the color document type classification method is 0 nm. (4) The color document type classification method according to claim 1, wherein the one primary color light is green light. (5) One of the two types of sensors has a sensitivity peak of 5.
40±15 nm, and the other sensor has a sensitivity peak of 570±15 nm, the color document type classification method according to claim 4. (6) first and second sensors that are within the wavelength range of the first primary color light of the three primary color lights and have sensitivity peaks at different wavelengths, and within the wavelength range of the second primary color light, Measure the reflected light of each area of the color document using third and fourth sensors having sensitivity peaks at different wavelengths, and obtain two types of measured values of the same area measured by the first and second sensors. and comparing two types of measurement values of the same area measured by the third and fourth sensors, and classifying the color original into at least a photographic original and a printed original based on a combination of these two comparison results. A color manuscript type classification method featuring the following. (7) The color document type classification method according to claim 6, wherein the first primary color light is red light and the second primary color light is green light. (8) The first sensor has a sensitivity peak of 630±4
0nm, and the second sensor has a sensitivity peak of 680±
40 nm, and the sensitivity peak of the third sensor is 540 nm.
±15 nm, and the fourth sensor has a sensitivity peak of 57 nm.
8. The color document type classification method according to claim 7, wherein the color document type classification method is 0±15 nm. (9) The color document type classification method according to claim 8, wherein the measured value is a density value. (10) If the number of cases where the difference between the two types of densities in the green wavelength range is less than or equal to a first threshold value is less than a certain value, the color original is determined to be a printed original, and the difference is equal to or more than the second threshold value. If the number exceeds a certain value, the color original is determined to be a photographic original, and for those that cannot be classified by these judgments, the difference in density between the two types in the red wavelength region is determined as a third threshold. Claim 9, characterized in that if the number of documents falling within the specified range is greater than or equal to a certain value, the color document is determined to be a photographic document, and the other documents are determined to be printed documents. Color manuscript type classification method.